Emma A. Ervin (Ervin, Emma A.)

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  Meet the Natives: A Beginner's Field Guide to Rocky Mountain Wildflowers, Trees, and Shrubs
  by M. Walter Pesman, Emma A. Ervin
  Softcover, Roberts Rinehart Pub, ISBN 1570984182 (1-57098-418-2)
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  Meet the Natives: The Amateur's Field Guide to Rocky Mountain Wildflowers, Trees and Shrubs
  by M. Walter Pesman, Emma A. Ervin
  Softcover, Natl Book Network, ISBN 1879373319 (1-879373-31-9)